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RISS 인기검색어
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Vineet Kumar Singh,Jampana Nagaraju,Sushobhan Avasthi 한국물리학회 2019 Current Applied Physics Vol.19 No.3
We demonstrate radial p-n junction silicon solar cells with micro-pillar array with higher short-circuit current and open-circuit voltage than comparable planar silicon solar cells. Micro-pillar array, fabricated by RIE, acts as an effective anti-reflection coating for visible light with less than 6% reflection. Compared to devices with planar surface, devices with micro-pillar array show a 27% enhancement in short circuit current. The radial p-n junction of the micro-pillars also improves extraction probability of the photogenerated carriers, which further increases the short circuit current. Typically, micro-pillar solar cells suffer from high recombination losses at the Si/metal interface, resulting in poor VOC. Our devices prevent these recombination losses by planarizing the Si/ metal interface, leading to an open circuit voltage of 622 mV, the highest ever reported for micro-pillar solar cells. This planarized contact also reduces the series resistance associated with radial junctions, leading to series resistance of ≤0.50 Ω-cm2 and fill factors up to 76.7%.
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Byeongcheol Min,Surya N. Jampana,Christoper M. Thomas,Bandaru V. Ramarao 한국펄프·종이공학회 2018 펄프.종이技術 Vol.50 No.2
Buffer substitution method were studied to improve the efficiency and to reduce cost of enzymatic hydrolysis of paper mill waste fines. The method is utilization of CaCO₃ in waste fine as a buffer material to substitute traditional buffer chemicals using in hydrolysis process. The 0.05M of sodium acetate buffer required 8.2 ㎏ of sodium acetate and 2.0 ㎏ of acetic acid per 100 ㎏ of waste fines to make the pH 5. When buffer solution and waste fines were mixed, the pH of the mixture shifted to 6.5-7.0 due to the dissociation of CaCO₃. The shifted pH was adjusted with addition of extra acids such as sulfuric acid and acetic acid to reach the pH to 5.2. Adjustment of pH increased waste fine hydrolysis yield from 33.7% to 41.4% by addition of extra acetic acid as much as 6.3 ㎏ per 100 kg of waste fines. For the buffer substitution method, only 7.7 ㎏ of acetic acid was demanded without sodium acetate for the same pH level (pH 5.2) of the mixture. The buffer substitution method resulted in 40.8% of hydrolysis yield which was comparable result of pH adjustment of buffer. The buffer substitution method reduced the requirement of 8.2 ㎏ of sodium acetate and 0.6 ㎏ of acetic acid for 100 ㎏ of waste fine hydrolysis. Addition of sulfuric acid resulted adverse effects compared to addition of acetic acid for both pH adjustment and buffer substitution.
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